Machine for grinding rods



(No Model.)

s. TRETHEWEY. Machine for Grinding RodsyS-h'afts, &0. No. 236,382.- Patented Jan. -4, I881.

MPETERa, PHDTO-LITHOGRAPHER. WASHINGTON, n. c.

Nrrn Sterne PATENT @rmcn.

SAMUEL TRETHEWEY, OF PITTSBURG, PENNSYLVANIA.

MACHINE FOR GRINDING RODS, SHAFTS, 800.

SPECIFICATION forming part of Letters Patent No. 236,382, dated January 4, 1881. Application filed November 15, 1880. (No model.)

To all whom it may concern Be it known that I, SAMUEL TRETHEWEY, of Pittsburg, county of Allegheny, State of Pennsylvania, have invented or discovered a new and useful Improvement in Machines for Grinding and Polishing Rods, Shafts, &c.; and I do hereby declare the following to be a 'full, clear, concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification,

in which-like letters indicating like parts- Figure l is a top-plan view of my improved grinding and polishing machine. Fig. 2 shows a side elevation of the same. Fig. 3 shows a transverse section taken in the plane of the line 00 m, Fig. 2; and Fig. 4: is a diagram illustrative of the manner of driving the feed-rolls.

In order to secure the best results in grinding and polishing shafting and similar rods and tubes, it is desirable to give the article rotary as well as endwise motion against and across the periphery of the stone.

My invention relates to a machine adapted to perform this work automatically; and it consists in the arrangement of two pairs or sets of feed-rolls in line on either side of a grinding or polishing stone, the periphery of the stone being adjusted to bear upon the rod or shaft in the line of feed, with a rest to support the rod as against the pressure of the stone, and the rolls ofeaeh set having their axes inclined across the line of feed in opposite directions, they being rotated in the same direction, whereby the rod or shaft is given both rotary and endwise or feed motion, as desired.

In the drawings, A A represent two sets or pairs of plain-faced feed-rolls mounted in housings B, with a common line of feed lengthwise of the rolls, which is represented by the rod (J. The rolls of each set are inclined to a horizontal plane crossing the line of feed in opposite directions, as illustrated in Figs. 1 and 2. Rotary motion in the same direction is given to these rolls by means of any suitable drivingpower, that shown beingabelt,1), which passes from pulley and shaft D above the rolls to and under both rolls of thepairorset, and, by preference, crossing between the pulley and rolls to give it longer bearing on the roll-surfaces. The arrangement of such beltis clearly illustrated in Figs. 2 and 4, and the same arrangement is applied to both sets of rolls,

though I have illustrated it as applied to one set, deeming this sufficient. Such disposition of the belt affords a cheap and convenient means of giving the rolls the'desired motion, an d leaves the line of feed free from obstruction. The arrangement and motion thus given to the rolls will impart to rod 0 a rotary as well as end wise feed motion.

The roll-necks are journaled in blocks E, which are secured within suitable openings 1) in the housings by binding or set screws 6, and by side plates or collars, c. The screws 6 also afford means for adjusting the rolls by moving the journal-blocks, and thereby adapt them to rods of different sizes. Other suitable or wellknown means of adjustment maybe employed, however.

Between the two sets of rolls A A is mounted a grinding or polishing stone, H, by shaft h and plumber-blocks H. The stone may be driven by band-wheel h, or in other convenient way. The stone H is so adjusted in position with relation to its diameter and the position of the rod that its periphery may bear against the rod with the desired pressure; and for thepurpose of adjusting the stone with relation to its work the plumber-blocks H are made movable toward and from the line of feed, and are secured by set-screws 2' working through the sides of an inclosing-frame, I, and by bolts 2', which bind the plumber-blocks to bed-plate F.

The rod G is supported as against the pressure of the stone by a rest or guide, R, which extends the whole or greater part of the distance between the two sets of rolls. The upper face-corner of this rest is grooved or rabbeted out, as at r, Fig. 3, so as to give a hearing upon two sides of the rod, or at two points in its circumference, and thereby operate both as a rest and as a guide to conduct the end of the rod from the first set of rolls to the second set. This I consider an important improvement, as without it there would be no certainty that the rod would properly enter the second set of rolls, owing to the tendency of the first set to shake or vibrate the end of the rod out ofthe line of feed. This rest R is supported on adjustable blocks S, which latter are bound to the bed-plate F by bolts 3 passing through slots 3 in the blocks. The rest may thus be adjusted toward and from the central line of feed, and when adjusted for small rounds a notch, 1", may be made in the face of the rest to permit it to be brought close to the periphcry of the stone. Also, for small rounds, a tubular guide may be substituted for the opensided guide R, as its mechanical equivalent, an opening being made in the tube to permit the periphery of the stone to bear upon the inolosed rod. Also, the usual tubular guides may be arranged to direct the rod to the first set of rolls and to receive it from the second set.

By employing two sets of feed-rolls, as described, one on either side of the stone, the rod is held much more firmly to its Work than if one set only were used; also, either set of rolls will continue the proper feed of the rod after it has passed or before it has reached the other set.

By using rolls of greater diameter than the rod a rapid rotary movement will be imparted to the latter, and the rate of forward feed may be adjusted with relation to the rotary movement by varying the angle of inclination between the axes of the rolls, whereby the rod may be subjected a greater or less time, as desired, to the action of the stone. The stone is driven, by preference, at a high rate of speed, and in either direction to the rotation of the rod.

By reversing the motion of the rolls the rod may be carried back and forth across the stone as many times as desired.

I claim herein as my invention- In combination with a rotary grinding or polishing stone, H, two sets or pairs of feedrolls, A A, one set or pair being arranged on SAMUEL TRETHEWEY.

X Vitnesses:

R. H. WVHrr'rLEsEY, O. S. PARKER. 

